ajaxfileupload上传文件
1、ajaxfileupload.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String path = request.getContextPath();
%>
<html>
<head>
<title>uploadifive-demo</title>
<script src="${pageContext.request.contextPath}/jslib/uploadifive-v1.2.2-standard/jquery.min.js" type="text/javascript"></script>
<script src="${pageContext.request.contextPath}/jslib/ajaxfileupload/ajaxfileupload.js" type="text/javascript"></script>
<script type="text/javascript">
function ajaxFileUpload(){
//开始上传文件时显示一个图片,文件上传完成将图片隐藏
//$("#loading").ajaxStart(function(){$(this).show();}).ajaxComplete(function(){$(this).hide();});
//执行上传文件操作的函数
$.ajaxFileUpload({
//处理文件上传操作的服务器端地址(可以传参数,已亲测可用)
url:'${pageContext.request.contextPath}/userController/fileUpload.do?uname=玄玉',
secureuri:false, //是否启用安全提交,默认为false
fileElementId:'myBlogImage', //文件选择框的id属性
dataType:'text', //服务器返回的格式,可以是json或xml等
success:function(data, status){ //服务器响应成功时的处理函数
data = data.replace(/<pre.*?>/g, ''); //ajaxFileUpload会对服务器响应回来的text内容加上<pre style="....">text</pre>前后缀
data = data.replace(/<PRE.*?>/g, '');
data = data.replace("<PRE>", '');
data = data.replace("</PRE>", '');
data = data.replace("<pre>", '');
data = data.replace("</pre>", ''); //本例中设定上传文件完毕后,服务端会返回给前台[0`filepath]
if(data.substring(0, 1) == 0){ //0表示上传成功(后跟上传后的文件路径),1表示失败(后跟失败描述)
$("img[id='uploadImage']").attr("src", data.substring(2));
$('#result').html("图片上传成功<br/>");
}else{
$('#result').html('图片上传失败，请重试！！');
}
},
error:function(data, status, e){ //服务器响应失败时的处理函数
$('#result').html('图片上传失败，请重试！！');
}
});
}
</script>
</head>
<body>
<h1>ajaxfileupload Demo</h1>
<div id="result"></div>
<img id="uploadImage" src="http://www.firefox.com.cn/favicon.ico">
<input type="file" id="myBlogImage" name="myfiles"/>
<input type="button" value="上传图片" onclick="ajaxFileUpload()"/>
<!--
AjaxFileUpload简介
官网:http://phpletter.com/Our-Projects/AjaxFileUpload/
简介:jQuery插件AjaxFileUpload能够实现无刷新上传文件,并且简单易用,它的使用人数很多,非常值得推荐
注意:引入js的顺序(它依赖于jQuery)和页面中并无表单(只是在按钮点击的时候触发ajaxFileUpload()方法)
常见错误及解决方案如下
1)SyntaxError: missing ; before statement
--检查URL路径是否可以访问
2)SyntaxError: syntax error
--检查处理提交操作的JSP文件是否存在语法错误
3)SyntaxError: invalid property id
--检查属性ID是否存在
4)SyntaxError: missing } in XML expression
--检查文件域名称是否一致或不存在
5)其它自定义错误
--可使用变量$error直接打印的方法检查各参数是否正确,比起上面这些无效的错误提示还是方便很多
-->
</body>
</html>
2、controller.java
/**
* 这里这里用的是MultipartFile[] myfiles参数,所以前台就要用<input type="file" name="myfiles"/>
* 上传文件完毕后返回给前台[0`filepath],0表示上传成功(后跟上传后的文件路径),1表示失败(后跟失败描述)
*/
@RequestMapping(value="/fileUpload")
public String addUser(@RequestParam("uname") String uname, @RequestParam MultipartFile[] myfiles, HttpServletRequest request, HttpServletResponse response) throws IOException{
//可以在上传文件的同时接收其它参数
System.out.println("收到用户[" + uname + "]的文件上传请求");
//如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\upload\\文件夹中
//这里实现文件上传操作用的是commons.io.FileUtils类,它会自动判断/upload是否存在,不存在会自动创建
String realPath = request.getSession().getServletContext().getRealPath("/upload");
//设置响应给前台内容的数据格式
response.setContentType("text/plain; charset=UTF-8");
//设置响应给前台内容的PrintWriter对象
PrintWriter out = response.getWriter();
//上传文件的原名(即上传前的文件名字)
String originalFilename = null;
//如果只是上传一个文件,则只需要MultipartFile类型接收文件即可,而且无需显式指定@RequestParam注解
//如果想上传多个文件,那么这里就要用MultipartFile[]类型来接收文件,并且要指定@RequestParam注解
//上传多个文件时,前台表单中的所有<input type="file"/>的name都应该是myfiles,否则参数里的myfiles无法获取到所有上传的文件
for(MultipartFile myfile : myfiles){
if(myfile.isEmpty()){
out.print("1`请选择文件后上传");
out.flush();
return null;
}else{
originalFilename = myfile.getOriginalFilename();
System.out.println("文件原名: " + originalFilename);
System.out.println("文件名称: " + myfile.getName());
System.out.println("文件长度: " + myfile.getSize());
System.out.println("文件类型: " + myfile.getContentType());
System.out.println("========================================");
try {
//这里不必处理IO流关闭的问题,因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉
//此处也可以使用Spring提供的MultipartFile.transferTo(File dest)方法实现文件的上传
FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(realPath, originalFilename));
} catch (IOException e) {
System.out.println("文件[" + originalFilename + "]上传失败,堆栈轨迹如下");
e.printStackTrace();
out.print("1`文件上传失败，请重试！！");
out.flush();
return null;
}
}
}
//此时在Windows下输出的是[D:\Develop\apache-tomcat-6.0.36\webapps\AjaxFileUpload\\upload\愤怒的小鸟.jpg]
//System.out.println(realPath + "\\" + originalFilename);
//此时在Windows下输出的是[/AjaxFileUpload/upload/愤怒的小鸟.jpg]
//System.out.println(request.getContextPath() + "/upload/" + originalFilename);
//不推荐返回[realPath + "\\" + originalFilename]的值
//因为在Windows下<img src="file:///D:/aa.jpg">能被firefox显示,而<img src="D:/aa.jpg">firefox是不认的
out.print("0`" + request.getContextPath() + "/upload/" + originalFilename);
out.flush();
return null;
}
3、ajaxfileupload.js
jQuery.extend({
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if(window.ActiveXObject)
{
if(typeof uri== 'boolean'){
iframeHtml += ' src="' + 'javascript:false' + '"';
}
else if(typeof uri== 'string'){
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},
createUploadForm: function(id, fileElementId, data)
{
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
if(data)
{
for(var i in data)
{
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
//set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},
ajaxFileUpload: function(s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime()
var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data));
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if ( s.global && ! jQuery.active++ )
{
jQuery.event.trigger( "ajaxStart" );
}
var requestDone = false;
// Create the request object
var xml = {}
if ( s.global )
jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var uploadCallback = function(isTimeout)
{
var io = document.getElementById(frameId);
try
{
if(io.contentWindow)
{
xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}else if(io.contentDocument)
{
xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
}
}catch(e)
{
jQuery.handleError(s, xml, null, e);
}
if ( xml || isTimeout == "timeout")
{
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if ( status != "error" )
{
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData( xml, s.dataType );
// If a local callback was specified, fire it and pass it the data
if ( s.success )
s.success( data, status );
// Fire the global callback
if( s.global )
jQuery.event.trigger( "ajaxSuccess", [xml, s] );
} else
jQuery.handleError(s, xml, status);
} catch(e)
{
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if( s.global )
jQuery.event.trigger( "ajaxComplete", [xml, s] );
// Handle the global AJAX counter
if ( s.global && ! --jQuery.active )
jQuery.event.trigger( "ajaxStop" );
// Process result
if ( s.complete )
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function()
{ try
{
jQuery(io).remove();
jQuery(form).remove();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if ( s.timeout > 0 )
{
setTimeout(function(){
// Check to see if the request is still happening
if( !requestDone ) uploadCallback( "timeout" );
}, s.timeout);
}
try
{
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if(form.encoding)
{
jQuery(form).attr('encoding', 'multipart/form-data');
}
else
{
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();
} catch(e)
{
jQuery.handleError(s, xml, null, e);
}
jQuery('#' + frameId).load(uploadCallback );
return {abort: function () {}};
},
uploadHttpData: function( r, type ) {
var data = !type;
data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if ( type == "script" )
jQuery.globalEval( data );
// Get the JavaScript object, if JSON is used.
if ( type == "json" )
eval( "data = " + data );
// evaluate scripts within html
if ( type == "html" )
jQuery("<div>").html(data).evalScripts();
return data;
}
})